Door lock



2 Sheets-Sheet 1 H. CHRlSTlAAN SEN DOOR LOCK Filed Jan. 14 1 i INVENTOR @afim Nov. 11, 1924.

WITNESS:

Nov. 11, 4- 1,515,550

5 H. CHRISTIAANSEN I DOOR LOCK Filed Jan. 14 1924 2 Shoots-Sheet 2 Patented Nov. 11, 1924. i

FFlC-E.

HENDRIK CHRISTIAANSEN, OF MILWAUKEE, WISCONSIN.

DOOR LOCK.

To all whom it may concern:

Be it known that I, I'IENDRTK CI-IRISTIAAN- snN, a citizen of Holland, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Door Locks, of which the following is a specification.

My present invention has reference to an improved door lock.

The object is the provision of a burglarproof lock which cannot be operated from the exterior of a room or building even when the key has not been operated to lock the bolts.

To the attainment of the foregoing, the

invention consists in the improvement as hereinafter described and definitely claimed.

In the drawings Figure 1 is a fragmentary elevation looking toward the inner face of a door provided with the improvement, the knob spindle being in section. v

Figure 2 is a similar View but showing the latching means in inoperative position.

Figure 3 is an approximately central longitudinal sectional view through the lock casing showing the bolts in locking position.

Figure 4 is a similar view showing the bolts retracted.

Figure 5 is a perspective view of the fixed element of the catch.

Figure 6 isa similar view of the slidable element of the catch.

Figure 7 is a similar view of the escutcheon plate for the slidable element of the catch.

Figure 8 is a detail sectional view through one of the bolts.

In the drawings, the numeral 1 designates the inner face of a hinged door. Let in the edge of the door there is the casing of my improved lock. The casing includes a central substantially rectangular body portion 2 having outer end extensions 3. Preferably the extensions 3 have their outer faces extended to provide lips 4 through which pass the securing means for holding the lock in the door.

In carrying out my invention, I make use of two bolts 5 and 6 respectively. These bolts are received in notches in a suitable keeper 50. The bolts have their active faces preferably beveled, as at 7, so that the same Application filed January 14, 1924. Serial No. 686,200.

can slide over the keeper plate and into the openings therein when the door is closed.

The bolts 6 and 7 are provided with right angular extensions or tail portions 8 and 9 respectively. The tail portions 8 and9 are directed. toward each other in the casing and have passed therethrough suitable pivot members 10 whereby the bolts are swingably sustained in the casing. Each bolt is contacted by a spring 11 for projecting the same through the opening in the face of the lock casing.

The knob spindle 12 is mounted in suitable bearing openings in the sides of the casing and, of course, passes through escutcheon plates on the inner and outer faces of the door. The spindle is substantially square in cross section and has secured thereon, by means 18, a throw element 14:. The element 14 comprises an elongated member having both of its ends tapered, and one of said ends, indicated by the numeral l5,underlies the tail8of the bolt 5. The opposite end of thethrow member 14 is in contacting engagement with one of the beveled edges 16 of a tumbler or auxiliary throw member for the bolt. This throw member 17 is pivoted in the casing, as at 18 and has a second beveled edge or face 19 that underlies the tail portion 9 of the bolt 6. From the foregoing, it will 'be apparent that when the knob spindle is turned to the position illustrated in Figure 4, the tail 8 of the bolt 5 will be swung toward the outer face plate of the casing by the turning of thethrow member 14:, and the latter influences the tumbler or throw member 17 to likewise swing the tail 8 of the bolt 6 in the same direction. Thus the bolts are retracted. The springs ll return the bolts to locking position when pressure on the knob connected with the spindle 12 is released.

Suitably mounted in the casing there are preferably spring influenced tumblers 2O kerfed or notched to receive the bit end of a key so that the same can be moved, when the key is turned, toward and to be raised upon their guides 21 to cause the end 15 to be received in notches 22 in the straight edges of the tumblers 20. The tumblers 20 are disposed below the keyhole openings 23 in the casing.

On the inner face of the door there is an escutcheon plate 2& of a particular construction. The spindle 12 passes through a suit able bearing opening in the escutcheon 24c, and fixed on the said spindle and disposed in close relation to the escutcheon 24, there is an approximately semi-circular plate The plate has its upper and straight edge formed with notches 26-26, adjacent to its sides or edges, providing therebetween a central lug 27 and end lugs 28. The central lug may be and preferably is of a greater length than the end lugs 28 and is also wider, and through the said central lug 27, the spindle 12 passes. Suitable means is employed for holding the plate on the spin dle. The plate 25 provides the fixed element of the latch for the door.

The slidable element of the latch is also in the nature of a plate semi-circular in plan, the said plate having its lower straight edges provided with a pair of spaced fingers 29 designed to be received in the notches 26, to receive therebetween the lug 27 and to be arranged in contacting engagement with the lugs 28 of the plate The slidable catch member 29 has an outer operating knob 30 and an inwardly extending headed lug 31. The lug 31 is received in a vertically disposed elongated slot 32 in the escutcheon 24. The lug 31 has its shank preferably square in cross section to contact with the side walls provided by the slot 32. The escutcheon plate 25is provided with a rounded opening 33 which communicates with the upper portion of the slot and provides an extension therefor. The lower wall provided by the opening 33 is substantially straight and is designed to receive and hold therein the lug 31 when the movable latch member 29 is slid to inoperative position. The head of the lug 31 at all times holds the latch element 29 against the outer face of the escutcheon plate 24.

V hen the latch elements 29 and 25 are in interengagement, it will be seen that the knob 12 cannot be turned. and thus the open ing of the door from the outside thereof will be positively prevented. Even when the tumblers engage the throw member 15, after the operation of the key, the lock cannot be picked, because the latching means will positively prevent the turning of the knob spindle 12 and unless the said spindle is turned the throw member 14 will prevent the throwing of the bolts to unlocking position. 2

Having described the inventiom I claim 1. In a look, a casing. bolts movable through the face thereof having inner angle ends which are pivoted in the casing, a

ber, a second throw member pivot-ed in the casing having opposed angle faces one of which is in contacting engagement with the first mentioned throw member and the other in engagement with the extension of the secend bolt. a fixed catch ii'iember on the knob spindle, a slidable catch member for cooperation therewitl'i. guide means for the slidable catch member. and means for sustain ing the said second catch member out of en gagement with the fixed catch member;

The combination'with a lock having spring influenced bolts, a knob spindle and means operated by the turning thereof for throwing the bolts to unlocking position, of a catch member fixed on the spindle and comprising an approximately semi-circular plate whose straight edge is notched adjacent to the sides thereof to provide a central and end lugs and the knob spindle passing through the central lug, an escutcheon plate through which the knob spindle also passes having, an elongated slot terminatin in a rounded downturned extension, :1. slidable latch elemei'it comprising a plate having spaced lugs to be received in the notches of the first menlioned'catch member, an operating knob on the outer face of the last mentioned catrh member. and a squared headed shank on the inne face thereof received in the slot of the escutcheon plate and movable into the angle branch thereof when the last mentioned catch member is to be sustained out of engagement with the first mentioned catch member.

In testimony whereof I affix my signature.

HENDBIK CHRltSlLLX N S ll N 

